Validating digital signatures in PDF documents is a tricky business, and contrary to popular belief, there’s no one true validation algorithm. I’m not going to try to tell you how to validate PDF signatures—that’d be hard to do in a blog post anyhow. Instead, I’ll turn things around, and try to give you some advice on how to produce PDF signatures that are easy to digest (pun intended) for validators.
Most of the content of this post is geared towards producing signatures for public workflows, i.e., cases where you don’t know who is going to need to validate your signature, so aiming for maximal interoperability is important. Most of the advice is still relevant for other, closed workflows as well, but it depends on the circumstances.
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